Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Python Basics (2015) Letter Game App Even or Odd Loop

Posted by Kyle Butterworth
Kyle Butterworth
5,743 Points

Issue with modulo (%) operator in coding challenges?

I'm trying to complete a coding challenge and it says there is an error somewhere with this code:

import random

def even_odd(num): boo = False if num % 2 == 0: boo = True return boo

start = 5

while start: rand = random.randint(1, 99)

if even_odd(rand):
    print("{} is even").format(rand)
else:
    print("{} is odd").format(rand)

start -= 1
even.py 
import random

def even_odd(num):
    boo = False
    if num % 2 == 0:
        boo = True
    return boo

start = 5

while start:
    rand = random.randint(1, 99)

    if even_odd(rand):
        print("{} is even").format(rand)
    else:
        print("{} is odd").format(rand)

    start -= 1

2 Answers

Sean T. Unwin
Sean T. Unwin
28,690 Points
Sean T. Unwin
Sean T. Unwin
28,690 Points

if num % 2 == 0: does not need to be evaluated against a 0 as the operation, num % 2 returns True or False only.

Steve Hunter
Steve Hunter
57,712 Points
Steve Hunter
Steve Hunter
57,712 Points

Hi Kyle,

There's a couple of points to deal with here. First, don't mess with even_odd(); it works just fine. You send it a number and it returns True or False depending whether the number is even or not. So, put that back as it was at the start of the challenge.

Then, you've not chained .format() onto the strings. The method is outside the brackets. Try moving the .format() inside the brackets of the print statement:

print("{} is even".format(rand))

That should work, then.

Let me know how you get on.

Steve.